Molding appliance.



A. T. RASMUSSEN.

MOLDING APPLIANCE.

APPLICATION FILED r23. 1, 190a.

901,471. Patentd Oct. 20, 1908;

llllll INVENTOR:

fl 1. 71145111145 531 1 I an: 0 rags,

may I I UNITED STATES PATENT orator);

ALFRED RASMUdSEN, OF LA CRO SSE, WISCONSIN. v

MOLDING arrnraucn.

Specification of Letters Patent.

Patented Oct. 20, 1908.

Application filed February 1, 1908. Serial No. 413,867.

To an whom 'it may concern: Belt known that I, ALFRED T. 'RAsM'UssnN,

a citizen of the United States, residing at La -(rosse, in the county of La Crosse and State of Wisconsin, have invented certain new and useful Improvements in 'Molding Appli- A further object is to provide means for directing the air conveying parts into engagement with the mold. .7 I

A still further object is to provide means for increasing or decreasing the p'ressure on the air conveying parts to hold the same inengagement with the mold and a still further object is to provide means for stopping the flow of air-or steam through the conveying parts.

. Other objects and advantages will be here'- inafter referred to and more particularly pointed out in the claim.'

" In the "accompanying drawings whic'hiare I made 'a part of this application, Figure 1 is a perspective view of a mold ,andparts to "convey the air or steam thereto, and, Fig. 2

is a central, vertical, sectional view through the mold and air-conveying parts.

Referring to the drawings in which simi Ian reference characters designate correspon'ding parts throughout the several'views,

A indicates a base, to which is secured a -sta'ndard B, the upper end 1 of the standard "being curved inwardly to extend over the I base A and is provided witha tubular socket below the socket .C, is a flask.D, which "flask is adapted to be -filled with any suitable .formof investment material E, which is ."capable of withstanding heatand, at the suspen same time, retain its shape and; in order to form a mold F in the material E, a pattern with a rejection thereon to format gate, is

did in the flask D and the material E placed around the same, said pattern being constructed of material that can be readily Resting upon thebase A and vertically burning the same and, when thepattcrn is so removed, the moldcavity is formed.

A conical depression G is formed around the gate H,- leading into the mold F, into which tlie'metal to be cast is placed and is melted by applying a blow pipe or torch thereto, and, when the pattern is composed of a substance destrnctible by fire, the application of a torch or blow pipe will have destroyed the pattern by the time the metal has reached a molten state. I

As soon as the metal has reached a. molten state, I provide my improved means for directing air or steam pressure onto the molten material to force thesame into the mold and 'cause it to reach all parts of the mold,

which consists of a plate I, which is of sufficient diameter to snuglyrest upon the upper end of the flask D, said plate being provided with a b'ore J,.- through which the air or disintegrated by washing or destroyed by steam may pass into engagement with molten metal. The air or steam is conveyed to the bore J through a tube K, the lower endof which tube is secured in any preferred mannet to the plate I, while the upper end of the tube has secured thereto a valve casing L, the lower end of the valve casing being provided with a seat M, withv which is adapted to cooperate a valve N, said valve being controlled through the medium of a stem O. which extends upwardly through the valvecasing L.

' The upper end of the valve casing L is rovided with a stufling box P; which stutting box is filled with the usual form of packing Q, so that the airor steam will be prevented. from passing between the stem 0 and up I end of the valve casing L.

he valve N is normally held in. engagement with the seat vM by introducing a spring R around the .upper end of the stem O and between the stufiing box P and an adjusting nut S, said nut being interiorly threaded to coiiperatevwith' threads on the stem 0 and by which means the tension of' the spring may be-increased' or decreased.

The upper end of the stem 0 is provided ywith a knob T, whereby pressure may be readily directed on said stemrwhen it is desired to depress the valve N and disengage the same from its seat. The air or steam is supplied from any suitable form'of pressure tank and is .conveyed to. the valve casing through a tubular extension U, said eXtenslon intersecting the casing at a point between the valve N and the stufling box P.

In operation, the metal 1s placed in the 5 depression G and melted in the usual or'any the valve in engagement with its seat, while I this operation is being performed.

When the plate I has beenproperly seated upon the flask-D, a continuous pressure is directed on the knob T and the-tensionof the spring R overcome, thereby removing the valve N- from its seat and permitting the air or steam to pass through the ftubeiK and.

- directly onto the molten metal, the tension required 'to overcome the tension of the spring, being sufiicient to tightly clamp the plate I into engagement with the flask D and prevent the escape of the air or steam between the plate and flask. By thus direct ing pressure on the molten substance in the mold, the metal will be forced into all parts of the mold and a perfect casting produced. The importance of forcing the metal into all parts of themold will be more readily apparent when it is stated that this device is adapted more particularly to be used by dentists for casting inlays or fillings for teeth, artificial crowns, dental bridges, regulating and retaining appliances, etc., although it will be understood that the same may be usedfor casting various articles where an 40 accurate casting is desired, suchas jewelry, or the like and, instead of meltingthe metal in, the depression G, said. metal may be poured from a ladle or similar appliance, while in a molten state and, instead of forming the mold in the manner shown, a divisional flask may be provided and the mold constructed around a pattern in the ordinary' -way.. It will further be seen that this form' of mold may-be used in casting articles so small that'the molten substance-would not enter the mold without forcing the same' i v thereinto with the air or steam pressure and,

by providing the adjusting nut S and arranging the same as shown, the tension ofspring R and, .by proper adjustment of the .stuifing box for the upper end of the casing,

the sprilw'R' may be readily increased or decreased, thereby increasing ordecreasing the amount of pressure required to-move the valve away from its seat, the greater the tension of the spring the greater the pressure of. the plate I upon the flask when the valve is removed from itsseat. It will thus be; seen that when the, pressure of the air or: steam is to be increased,the adjusting nut S is operated to increase'th'e tension of the 65. nut, the required amount of'pressure on the plate I to prevent the escape of the air'or steam between the flask and plate, will be accomplished. I

It will thus be seen that Lhave provided a very cheap and economical form'of means for directing'pressure uponvmolten metal toforce the same into all parts of the moldand produce a'perfect casting and, by arranging the parts as shown, it will be seen that suchparts as are necessary to be handled, will be a sufficient distance from the molten substance as not to become heated.

What I claim is;

In a molding appliance, the combination with a flask having a mold therein and means to support said flask {of a plate adapted to be seated on said flask, said plate h av-. ing a bore registeringw ith the mold, an air or steam conveying tube secured to the plate, 85 a valve casing at the upper end of the tube, a seat .at the lower end of the valve casing, a valve adaptedgto coiiperate with said seat, a" stem extending upwardly from the valve, a

a sprin surrounding the stem and resting upon the stufiing box, an adjustin nut threaded onto the upper end of sai stem adapted to regulate the tension of the spring,

means to conveyair "or steam into the valve casing above the valve, a socket to movably receive the tube and a knob at the upper end of the stem to receive pressure, wherebythe plate maybe lowered into en agementwith the flaskand the valve move from its seat.

In testimonywhe'reof I hav e signed my name to this specification in the presence oftwo subscribing witnesses. I

ALERED T; RASMUSSEN.

Witnesses:

JOHN

W. I Hnnnnwnn, v GnoRen F. Hansen. 

